AgCuTi Alloy Research Articles

Delamination Behavior and Formation Mechanism of the Interfacial Microstructure in the Brazed Joint of Silver-copper-titanium Alloy and Cubic Boron Nitride Grain

The joining experiments are carried out with heating temperature 920 "C for dwell time 5 rain on cubic boron nitride (CBN)abrasive grains and 0.45%C steel by using silver-copper-titanium(AgCuTi)alloy as brazing filler.The interracial microstruc- ture and newly-formed phases are detected with scanning electron microscope(SEM),energy dispersion spectrometer(EDS)and X-ray diffraction(XRD).The results show that the delamination phenomenon in the interfacial layer takes place during brazing.From CBN grain to the filler,the interfacial region is composed of a transitional layer,i.e.CBN/TiB_2/TiB/TiN/Ti contained allay,which has the remarkable advantage in improving the performance of the brazed joint.The interracial compounds could be formed in virtue of the displacement reaction according to the thermodynamic analysis.Meanwhile,the formation sequence of the reaction products(TiN, TiB_2,TiB)is determined by the difference in the diffusion behavior of B and N atoms.